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Speed prediction model of free-flowing passenger car on long and steep downgrades(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2009年04期
Page:
43-47
Research Field:
Publishing date:
2009-08-20

Info

Title:
Speed prediction model of free-flowing passenger car on long and steep downgrades
Author(s):
DENG Yun-chao
Institute of Engineering Design,Chang’an University,Xi’an 710064,Shaanxi,China
Keywords:
road engineering;  long and steep downgrade;  operating speed;  prediction model
PACS:
U412.3
DOI:
-
Abstract:
In order to improve the rationality of the safety facilities set on long and steep downgrades section of highgrade highways, this paper put forward the project to collect the operating speed data of freeflowing passenger car on the long and steep downgrades, analyzed the relationship among operating speed, length and slope of the highway according to statistics principle, built common speed prediction model of freeflowing passenger car on long and steep downgrades of highgrade highways, established multiple regression equation for operating speed prediction model of freeflowing passenger car on a certain long and steep downgrades section of a firstclass highway in Qinghai Province by regression analysis of practical test data. The comparison between the observation speed and prediction speed show that the predictive values and observed values of the car speed on the survey sections are basically same, the operating speed of car on the long and steep downgrades is mainly affected by length and slope, and the operating speed prediction model of freeflowing passenger car on a certain long and steep downgrades can reflect the change law of the speed of the car running on the long and steep downgrades section. 7 tabs, 8 figs, 10 refs.

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Last Update: 2009-08-20